Machine for bending metal



Feb. 15; 1927.

J. KARPOUICH MACHINE FOR BENDING METAL 4 Sheets-Sheet 1 Ihvenior; v Karpou Id"! Filed July 20. 1922 John A1 fys I 1,61791 Feb. 15,1927 J KARPOUICH 3 MACHINE FOR BENDING METAL I Filed Ju1y 20, 1922 4 Sheet s-Sheet 2 as Inventor.

Jghn Karpouich Ai Tys l, 17, 1 Feb. 1927' .1. KAREOUICH 6 9 3 momma FOR BENDING} METAL Filed July 20, 1922 4 Sheets-Shet s Fig. 5.

III/III; l 4 6 v lnven1or Q I John ,Korpoulch b wwaw W 1 1 1 Feb. 15,1921. J. KARPOUICH ,6 7,9 3

MACHINE FOR SENDING METAL Filed July 20, 1922 4 Sheets-Sheet 4 Fig.2 (4 73 InvenTor. John Kgrpouich iyf we w 'ATTys.

Patented Feb. 15, 1927.

mien

barren erases earner caries.

JOHN KARPOUICH, OF SOUTH BOSTON, MASSACHUSETTS, ASSIGNOR TO HAMILTON C.

PERKINS, OF BOSTON, MASSACHUSETTS.

MACHINE FOR IBENDING METAL.

Application filed July 20,

This invention relates to machines for bending metal and particularly to a machine adapted to bend angle iron.

One of the objects of the invention is to provide a novel machine of this type havmg improved means for holding the angle iron and bending it into shape and also having improved means for acting on the horizontal leg of the angle iron during the bendlng operation to flatten it out and prevent it from wrinkling or bulging up.

Other objects of the invention are to 1mprove generally machines of this type all as will be more fully hereinafter set forth.

In order to give an understanding of the invention I have illustrated in the drawings a selected embodiment thereof which will now be described after which the novel features will be pointed out in the appended claims.

Figure 1 is a side View of a machine embodying my invention.

Fig. 2 is an end view thereof.

Fig. 3 is a sectional view showing the driving means for operating the machine.

Fig. 4 is a side view of the driving gear.

Fig. 5 is a top plan view of the machine with the hammer omitted.

Fig. 6 is a section on the line 66, Fig. 7.

Fig. 7 is a plan view similar to Fig. 5 but showing the parts in the position they assume after the angle iron has been bent.

Fig. 8 is a section on the line 8-8, Fig. 9.

Fig. 9 is a. plan view similar to Fig. 7 but showing a device for forming an offset in the bent angle iron.

Fig. 10 is a plan view similar to Fig. 5 showing a machine adapted to bend flat metal.

Fig. 11 is a section on the line. 11-11, Fig. 10. a

Fig. 12 is a section on the line 12, Fig. 10.

Fig. 13 is a perspective view of a piece of angle iron showing the manner in which it may be bent by my improved machine.

Fig. 14 is a similar view showing a piece of fiat iron bent edgewise in the machine.

Fig. 15 illustrates the reversing gear.

My improved machine comprises a base 1 which sustains two work-holding members adapted to engage and clamp two different portions of a piece of angle iron to be bent, one of the work-holding member being mounted to turn relative to the other thereby to bend the angle iron to the desired shape.

1922. Serial No. 576,301.

The two work-holding members are shown at- 2 and 3 respectively, 2 being the stationary work-holding member and 3 the movable ward and from the member 4 thereby to clamp the leg of the angle iron in the groove 6 and the clamping movement of thememb er 5 is accomplished by means of cam members 7 actuated by levers 8, said cam meme bers operating between the clamping memher 5 and a stationary or fixed wall 9.

The work-holding member 8 has a some what similar construction, it comprising two clamping members 10 and 11 forming a groove 12 between them, which is adapted to receive the vertical leg of the angle iron. The clamping member 11 is the movable clamp member and it is also given its clamping movement by means of cam members 13 actuated by levers 14, said cam members being situated between the movable clamping member 11 and a wall or abutment 15.

Each clamping member supports a positioning stop 16 adapted to engage the end of the angle iron and properly position it.

These stops are shown as carried by blocks 7 17 which are adjustably mounted on arms 18 extending from the work-holding members, said positioning stops 16 being backed by adjusting screws 19. With this construction it is possible to adjust the positioning stops toward and from each other to accommodate diiferent lengths of angle iron. 7

The work-holding member 3 is movably mounted on the base 1 so that it can swing about the point 20 as a center from the position shown in Fig. 5 to that shown in Fig. 7 When it is in the position shown in Fig. 5 the groove 12 is in alignment with the groove 6 so that the vertical leg of the angle iron may be inserted in said aligned, grooves, the horizontal leg of the angle iron resting on the members 4, 10. After the angle iron has been clamped in the work-holding members then the work-holding member 3 may be turned into the position shown in Fig. 7, thus bending the angle iron into a right-angular position. In said Fig. 7 the angle iron is indicated by dotted lines at 21.

The movable work-holding member 3 may be supported on the base 1 in any suitable way which will permit it to have this turning movement. As illustrating one construction I have shown said base as having an axial projection 22 which enters a recess in the member 3 and forms a pivot about which the member 3 turns as clearly seen in Fig. 6.

For giving the turning movement to the work-holding member 3 I have herein provided the following construction.

' Said work-holding member 3 has a link 23 pivoted thereto at 24, said link also being pivotally connected to a slide 25 that is slidably mounted on a guide member 26. This slide is connected by a pitman or connecting rod 27 with a crank pin 28 carried by a crank disk 29 that is journalled on a stud 30 This crank pin is adjustably connected to the crank disk so as to provide for giving a greater or less movement to the member 3 depending upon whet-her it is desired to bend the angle iron into a right angle or make a less bend therein. F or this purpose the crank pin 28 is carried by an adjusting screw 31 which is mounted in the crank disk 29 and by turning said adjusting screw the crank pin is moved radially in the slot 32.

The crank disk 29 is formed 011 its rear face with an internal gear 33 with which meshes a pinion 34 on a shaft 35 that is carried by a suitable support 36. This shaft 35 has a large gear 37 fast thereon which meshes with a gear 38 loosely mounted on a shaft 39 also supported in said support 36. The gear 38 is adapted to be clutched to the shaft 39 by means of a clutch member 40 slidably mounted on but keyed to said shaft 39 and the shaft 39 has fast thereon another gear 41 meshing with and driven by a smaller gear 42 that is rigid with a driving pulley 43 loosely mounted on the shaft 35, said driving pulley being driven by a driving belt. The shaft 35 has a loose pulley 44 there-on onto which the driving belt may be shifted when the machine is to be stopped. This construction provides a form of reducing gearing for giving the desired movement to the member 3.

The gearing I have illustrated also has a reverse gear by which the crank disk 29 may be operated in a reverse direction from the driving pulley. This reverse gear comprises a gear 45 loose on the shaft 39 but adapted to be clutched thereto by the clutch 40, a gear 46 meshing with the gear 45 and fast on a countershaft 47, a gear 48 also fast on the shaft 47 and meshing with the gear 37. When the clutch is thrown so as to clutch the gear 45 to the shaft 39 then the crank disk will be operated in av reverse direction from that into which it operates when the gear 38 is clutched to the shaft 39. This clutch 40 may be operated from any suitable clutch actuator 50.

The guide 26 is shown as provided with indicating marks 51 which co-operate with the slide 25 to determine the degree of bending. The indicating marks shown are indicative of degrees and if the device is operated to bring the slide 16 up to the 45 mark then the member 3 will have been turned through 45 thus bending the angle iron to this extent. The other graduations on this scale indicate the point where the slide 25 must stop in order to get the amount of bending indicated by the mark.

As a further means of guiding the operator and determining the amount of bend,

I have provided the crank disk with a graduation scale 52 and have provided the crank pin with a pointer 53 operating over said scale. This scale shows the position in which to adjust the crank pin in order to bend the angle iron to any particular angle.

' When anangle iron is thus bent the horizontal leg thereof will tend to buckle at the point of bending and I have provided herein means for flattening the iron at this point. Such means comprises a flatter 54 adapted to be placed on the angle iron and a trip hammer 55 arranged to operate on the flatter. While any desired trip hammer may be used I have illustrated one in the form of a helve hammer, the hammer being mounted on a beam or helve 56 pivoted at 57 to a stand or frame 58. The helve is given its vertical movement by means of an eccentric 59 operating on a shaft 60 which may be driven from any suitable source of power, said shaft being shown as provided with a driving pulley 61. The eccentric is connected to the helve by an eccentric strap 62 and a connection 63.

In the operation of the device the parts will be adjusted into position shown in Fig. 5 and the angle iron will be placed in posi tion with its vertical leg in the aligned grooves 6 and 12. After the angle iron has been firmly clamped in place, the machine is started and is allowed to run until the work-holding member 3 has been turned into a position to bend the angle iron to the proper angle at which time the machine will be brought to rest.

During the bending operation the flatter 54 is in its inoperative position shown in Fig. 5 and after the angle iron has been bent the flatter is swung over in its operative position shown in Figs. 6 and 7 and the trip hammer is set in operation to cause the flatter to flatten out the horizontal leg at the angle. The flatter is shown as having a flat face 64 adapted to rest on the horizontal leg of the angle iron 21 and is also provided with a vertical flange 65 which is angular in shape and is adapted to fit around the corner of the angle iron. This flatter is carried by an arm 66 which is pivoted at 67 to a vertically-adjustable slide 68 carried by the member 3, the vertical adjustment providing for raising the flatter tothe proper position. 7 i

The parts are so constructed that the axial line about which the member 3 moves and at which the bend takes place is situated in the exterior face of the angle iron, and, therefore, during the bending operation there is no stretching of any part of the metal but on the contrary the metal is subjected to compression. For instance, in Fig. 13 wherein a piece of angle iron is shown bent into right angular shape the axis about which the bend takes place is at the outer corner 69. This has the advantage that it involves no stretching of the metal at the bend and, therefore, the angle iron will be of full size at all points.

In Figs. 10 and 11 I have shown an adaption of the machine adapted to bend flat iron strip into angular shape, as shown in Fig. 14. In Fig. 10 such strip is shown at 70 and it is held retained between the clamping members 6 and 12 and two adjustable stops 71, 72, the latter being held in adjusted position by adjusting screws 73. These stops 71, 72 carry retaining bolts 74, the heads 7 5 of which operate in T slots 76 formed in the parts at and 10. w

The operation of this device is similar to that for bending angle iron, the only difference being the manner of holding the work 70 in place.

In Figs. 8 and 9 I have shown a construction adapted to form an ofiset in the bent angle iron near the angle thereof. In order to do this I employ a spacing member 80 which may be inserted in each of the grooves 6 and 12 on the inside of the angle iron, said spacing member terminating at a distance from the corner as indicated at 81. The vertical leg of the angle iron 21 is inserted between the spacing member SO'and the clamping member 11. The offsetting of the angle iron is accomplished by a wedgeshaped member 82 which slides vertically on a backing member 83 that is secured to the'abutment 15. This wedge-shaped member 82 has a head 8 1 which can be struck with a hammer. The oifsetting is done by driving the wedged member 82 downwardly, this operation olfsetting the vertical leg of the angle iron which is beyond the spacing member 80, as shown clearly in Fig. 9.

While I have herein illustrated the operation of either bending the angle iron or fiat stock yet I desire to state that the in vention is equally applicable for bending stock of any cross-sectional shape whether round or in the form of a bar.

One of the features of the invention relates to a construction in which the bending of the angle iron, flat stock or other piece is about an axis situated in the outer or back face of the stock. The advantage of this is that no portion of the stock is stretched during the bending and, therefore, the completed article will have the full cross-sectional dimension at all points.

I claim: V V

1. In a machine for bending iron, the combination with two work-holding members having means for clamping in position a bar to be bent, which bar has'a portion which forms a flat web or flange, of means to move said members relative to each other about an axis extending at right angles to said web, whereby said web is bent edgewise, a flatter adapted to engage the web at the point where it is bent, and a power hammer operating on the flatter.

2. In a machine for bending iron, the combination with two work-holding members having means for clamping in position a bar to be bent, which bar has a portion which forms a flat web or flange, of means to move said members relative to eachother about anaxis extending at right angles to said web, whereby said web is bent edgewise, a pivotally mounted flatter adapted to be swung into a position to engage the work I where the bend takes place, and a power. hammer for operating on said flatter.

3. In a machine of the class described, the combination with a stationary work-supporting member, of a pivotally mounted work-supporting member, a crank disk operating in a plane parallel to the axis of movement of the pivoted work-supporting member, a link connecting the crank" disk to the pivotally mounted member and reversible gearing for operating the crankdisk.

1. In a machine of the class described, the

combination with a stationary work-supporting member, of a pivotally mounted work-supporting member, a crank disk having an adjustable crank pin and operating in a plane parallel to the pivotal axis of the pivoted work-supporting member, means connecting said crank pin to the movable work-supporting member, and reversible gearing for operating the crank disk.

5. In a machine for bending angle iron,

the combination with a stationary work holder, of a movale work holder mounted to turn about an axis, each work holder having work clamping means for clamping in place the angle iron to be bent, means carried by the movable work holder to form an ofiset in the angle iron, and means to give the movable work holder a turning movement about its axis thereby to bend the angle iron. V V V In testimony whereof,I have signed my name to this specification. V V

JOHN KARBOUICI-I. 

